Official Luthiers Forum!

Owned and operated by Lance Kragenbrink
It is currently Tue Mar 19, 2024 3:17 am


All times are UTC - 5 hours





Post new topic Reply to topic  [ 8 posts ] 
Author Message
PostPosted: Mon Feb 22, 2016 6:24 am 
Offline
Contributing Member
Contributing Member
User avatar

Joined: Fri Jul 10, 2009 4:44 am
Posts: 5396
First name: colin
Last Name: north
Country: Scotland.
Focus: Build
Status: Semi-pro
Nothing that special, but knocked this up to fit a plastic binding strip at the tail because it has to be pretty nigh perfect for depth control, and hand tools were a challenge with the wood involved.
Pretty self explanatory, rectangular 1/2" birch ply halves connected by 4" x 1.5" of 1/2"" birch ply strips (to clear bolt slots) glued underneath at front and back.
2 pieces of 2 1/2" high x 2" wide pine bars underneath to grip guitar (cut out to clear the 1/2" birch ply connecting strips), with 2 1/2" square x 1/8" cork pads at the gripping ends underneath.
Held in place with cam clamps.
The slots are 1 mm wider than the 1/4" coach bolts diameter to allow "floating" adjustment for lining up, uses a 20 mm guide bush in the router.
Line up was set with an acrylic strip 20mm wide with centre line scribed on it, checked with a 1/4" pointed rod in the router, cut with 6 mm 2 flute straight bit and a fine depth adjustment in small steps.

I also use a similar set-up for routing an oval soundport, using a 6 mm mdf plate with an oval cut in it, and can vary guide bush sizes to change hole size (cut with a spiral downcut bit)


You do not have the required permissions to view the files attached to this post.

_________________
The name catgut is confusing. There are two explanations for the mix up.

Catgut is an abbreviation of the word cattle gut. Gut strings are made from sheep or goat intestines, in the past even from horse, mule or donkey intestines.

Otherwise it could be from the word kitgut or kitstring. Kit meant fiddle, not kitten.


Last edited by Colin North on Mon Feb 22, 2016 10:44 am, edited 1 time in total.


These users thanked the author Colin North for the post: Joe Beaver (Thu Mar 23, 2017 1:13 pm)
Top
 Profile  
 
PostPosted: Mon Feb 22, 2016 7:32 am 
Offline
Old Growth Brazilian Rosewood
Old Growth Brazilian Rosewood
User avatar

Joined: Fri Nov 02, 2007 9:49 am
Posts: 12964
Location: Ann Arbor, Michigan
First name: Hesh
Last Name: Breakstone
City: Ann Arbor
State: Michigan
Country: United States
Status: Professional
Nice Colin, great jig! This is way easier than what I used to do free hand with an engineer's scale as a guide.

Thanks for posting this!

_________________
Ann Arbor Guitars


Top
 Profile  
 
PostPosted: Mon Feb 22, 2016 9:48 am 
Offline
Contributing Member
Contributing Member
User avatar

Joined: Tue Mar 01, 2011 1:32 pm
Posts: 3470
First name: Alex
Last Name: Kleon
City: Whitby
State: Ontario
Zip/Postal Code: L1N8X2
Country: Canada
Focus: Build
Status: Amateur
Thanks for sharing, Colin! I always have lots of scrap ply kicking around, so I'll be making one soon!

Alex

_________________
"Indecision is the key to flexibility" .... Bumper sticker


Top
 Profile  
 
PostPosted: Mon Feb 22, 2016 10:42 am 
Offline
Contributing Member
Contributing Member
User avatar

Joined: Fri Jul 10, 2009 4:44 am
Posts: 5396
First name: colin
Last Name: north
Country: Scotland.
Focus: Build
Status: Semi-pro
Some more pics, better than a description - End and side views, note the amended dimensions in first post.
Attachment:
DSCN3364.JPG

Excuse the CA everywhere, I'll maybe pretty it up and nicely round the corners later.
Attachment:
DSCN3363.JPG


Worked fine
Attachment:
DSCN3351.JPG


You do not have the required permissions to view the files attached to this post.

_________________
The name catgut is confusing. There are two explanations for the mix up.

Catgut is an abbreviation of the word cattle gut. Gut strings are made from sheep or goat intestines, in the past even from horse, mule or donkey intestines.

Otherwise it could be from the word kitgut or kitstring. Kit meant fiddle, not kitten.


Top
 Profile  
 
PostPosted: Mon Feb 22, 2016 10:58 am 
Offline
Contributing Member
Contributing Member
User avatar

Joined: Fri Jul 10, 2009 4:44 am
Posts: 5396
First name: colin
Last Name: north
Country: Scotland.
Focus: Build
Status: Semi-pro
Hesh wrote:
Nice Colin, great jig! This is way easier than what I used to do free hand with an engineer's scale as a guide.

Yes, used to do it the same way, but last guitar I made with this wood was pretty tough to cut and chisel without chipping out and needed some filling, so wanted to avoid that.

_________________
The name catgut is confusing. There are two explanations for the mix up.

Catgut is an abbreviation of the word cattle gut. Gut strings are made from sheep or goat intestines, in the past even from horse, mule or donkey intestines.

Otherwise it could be from the word kitgut or kitstring. Kit meant fiddle, not kitten.


Top
 Profile  
 
PostPosted: Mon Feb 22, 2016 10:32 pm 
Offline
Contributing Member
Contributing Member

Joined: Sun Feb 17, 2013 4:58 pm
Posts: 1449
First name: Ed
Last Name: Minch
City: Chestertown
State: MD
Zip/Postal Code: 21620
Country: United States
Focus: Build
Status: Amateur
Colin

Simple and eloquent - the best kind of jig. Why not permantely fasten one of the 2 X 's to ensure that the cut is square to the body?

Ed



These users thanked the author Ruby50 for the post: Colin North (Tue Feb 23, 2016 3:09 am)
Top
 Profile  
 
PostPosted: Tue Feb 23, 2016 3:24 am 
Offline
Contributing Member
Contributing Member
User avatar

Joined: Fri Jul 10, 2009 4:44 am
Posts: 5396
First name: colin
Last Name: north
Country: Scotland.
Focus: Build
Status: Semi-pro
Hi Ed. You could if you want.
But with the 1/8" cork to prevent marking the guitar, it will compress (it also takes up some of the curve of top and back), any difference in clamping pressure side to side, the actual areas of contact of the cork on each side , or compressability of the cork itself will misalign it.
Also this flexibility allows for any slight variation you may actually want to make in the end strip alignment, due to top/back plates being slightly misaligned, lining up with centre strips in the back for example, or a noticeable pattern in the top plate.
This variation may be less noticeable than a slight misalignment of center strip and tail end strip.

_________________
The name catgut is confusing. There are two explanations for the mix up.

Catgut is an abbreviation of the word cattle gut. Gut strings are made from sheep or goat intestines, in the past even from horse, mule or donkey intestines.

Otherwise it could be from the word kitgut or kitstring. Kit meant fiddle, not kitten.


Top
 Profile  
 
PostPosted: Wed Feb 24, 2016 5:48 am 
Offline
Contributing Member
Contributing Member

Joined: Sun Feb 17, 2013 4:58 pm
Posts: 1449
First name: Ed
Last Name: Minch
City: Chestertown
State: MD
Zip/Postal Code: 21620
Country: United States
Focus: Build
Status: Amateur
Colin

I get it - good call

Ed


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 5 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB® Forum Software © phpBB Group
phpBB customization services by 2by2host.com